We note that the flux-density of the hotspots A and D at 151 MHz, are about 10 per cent lower than those measured by [1]} using MERLIN at 151 MHz (after correcting for the different beam sizes). However, [1]} comment that they may have over-estimated the flux-density of the hotspots, relative to the extended emission, since they used two point sources to describe the hotspot emission in their starting calibration model. Also, since the LOFAR dataset has a much larger number of antennas relative to the MERLIN dataset, the self-calibration process used for the LOFAR dataset will be more robust.
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